class_docstr: Wrapper for printable lists ensuring that the list is printed/represented the same way in Py2 and Py3.
  Use with caution: in PY2, this will work only if all items in the list are ascii-compatible.
  Mainly aimed for usage in docstrings or warnings where list items are defined statically.
code: def __init__(self, arr):
      super(PList, self).__init__(arr)
  
file_path: h2o-3/h2o-py/h2o/utils/compatibility.py
label_desc: Use image node_id 1 to create a new PList object from inherited base classes: list with example: obj = PList(arr)